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If the density of some lake water is 1.2.5 g mL^(-1) and contains 92 g of Na^(+) ions per kg of water, calculate the molality of Na^(+) ions in the lake.

In a 7.0 L evacuated chamber, 0.50 mol H_(2) and 0.50 mol I_(2) react at 427°C H_(2)(g) + I_(2) (g)hArr2HI(g). At the given temperature, K_(c) = 49 for the reaction. What is the partial pressure (atm) of HI in the equilibrium mixture ?

If the density of methanol is 0.793kg L^(-1), what is its volume needed for making 2.5 L of its 0.25 M solutoin?

In a 7.0 L evacuated chamber, 0.50 mol H_(2) and 0.50 mol I_(2) react at 427°C H_(2)(g) + I_(2) (g)hArr2HI(g). At the given temperature, K_(c) = 49 for the reaction. How many moles of the iodine remain unreacted at equilibrium ?

If the density of crystalline CsCI is 3.988 g cm^-3 , calculate the volume effectively occupied by a single CsCl ion pair in the crystal ( CsCl = 168.4 )

In a 7.0 L evacuated chamber, 0.50 mol H_(2) and 0.50 mol I_(2) react at 427°C H_(2)(g) + I_(2) (g)hArr2HI(g). At the given temperature, K_(c) = 49 for the reaction. What is the total pressure (atm) in the chamber

If the density of a solvent is greater than 1 kg. dm^(-3) then the molarity (M) and molality (m) are related as

In a 500ml capacity vessel CO and Cl_(2). are mixed to from COCl_(2). At equilibrium, it constains 0.2 moles of COCl_(2) and 0.1 mole of each of CO and Cl_(2). the equilibrium constant K_(c) for the reaction CO+CL_(2) hArr COCl_(2) is

If the density of a solution is "3.12 g mL"^(-1), the mass of 1.5 mL solution in significant figures is ……….. .

If the densities of nuclei of ""_(1) H^(1) and ""_(92) U^(238) are X and Y respectively ,then correct relation is

If the DeltaG of a cell reaction AgCl+e^(-)toAg+Cl^(-) is -21.20Kj, The standard e.m.f. of the cell is

If the degree of dissociation of PCl_5at a certain temperature and 1 atm is 0.2,calculate the pressure at which the substance will be half-dissociated at the same temperature.

In a 7.0 L evacuated chamber, 0.50 mol H_(2) and 0.50 mol I_(2) react at 427°C H_(2)(g) + I_(2) (g)hArr2HI(g). At the given temperature, K_(c) = 49 for the reaction. What is the value of K_(p) ?

If the degree of association is 70% for the reaction 2A hArr(A)_2 athe van't Hoff factor for the solute 'A' is

In a 50 - mL solution of H_(2)O_(2)an excess of KI and dilute H_(2)SO_(4)were added The I_(2)so liberated required 20 mL of 0.1 N Na_(2)S_(2)O_(3)for complete reaction . Caculate the strength of H_(2)O_(2) in grams per litre .

If the current is passed into the solution of an electrolyte

In a 3-litre vessel the following equilibrium partial pressures are measured:N_2 = 190 mm, H_2 = 317 mm, NH_3= 1000 mm. Hydrogen is removed from the vessel until the pressure of nitrogen at equilibrium is equal to 250 mm. Calculate the pressure of other substances under the new condition.

In a 3D hexagonal unit cell of identical atoms, the number of atoms that will contribute their 100% volume within the cell would be:

If the currentis passed into the solution of an electrolyte :

In a 1st order reaction, reactant concentration C varies with times t as:

If the critical temperature of a gas is 500 K, then which of the following is correct for the same gas ?

In a 1.0 L aqueous solution when the reaction 2Ag^(+)(aq) + Cu(s) rarr Cu^(2+)(aq) + 2Ag(s) reaches equilibrium,[Cu^(2+)] = xM "and" [Ag^(+)] = yM If the volume of solution is doubled by adding water, then at equilibrium :

In a 10 litre box 2.5 mole hydroiodic acid is taken. After equilibrium 2HI

If the corrdination number of an element in its crystal lattice is 8, then packing is :

In a 0.2 molal aqueous solution of a weak acid HX the degree of ionization is 0.3. Taking K_(f) for water as 1.85, the freezing point of the solution will be nearest to

If the configuration of manganese is [Ar]3d^(6),4s^(2), then maximum oxidation number of m anganese will be

In a 0.2 molal aqueous solution of aweal acid, HX, the degree of dissociation is 0.3 . Taking K_(f) for water as 1.85, the freezing point of the solution will be nearest to

if the conductance and specific conductance of a solution is one then its cell constant would be

If the concentraton of the reactants is increased ,the rate of reaction

If the concentrations are expressed in mole litre^(-1) and time in sec then the units of the rate constant for the first order reaction are :

In 3d-series,manganese shows maximum number of oxidation states.

If the concentration units for the first order reaction is increased by 'm' times, then the rate constant k will be

In 3d-series which element has positive E_(M^(2+)//M)^(@) value? Why?

If the concentration units are reduced by n times, then the value of rate constant of first order will

In 3d-series which element cannot displace hydrogen gas from dilute acids? Why?

In 3d series which element has highest melting point

If the concentration units are reduced by n times, then the value of rate constant of first order will:

In 3d series (Sc to Zn), the enthalpy of atomization of Zn is low. Why ?

If the concentration of water vapour in the air is 1% and the total atmospheric pressure equals to 1 atm then the partial pressure of water vapours is

In 2002 A.D. according to research the concentration of CFC reached to

If the concentration of water vapour in the air is 1% and the total atmospheric pressure equals 1 atm then the partial pressure of water vapour is :

If the concentration of OH^(-) ions in the reaction Fe(OH)_(3)(s)hArr Fe^(3+)(aq)+3OH^(-)(aq)is decreased by 1/4 times, then equilibrium concentration of Fe^(3+) will increase by

If the concentration of OH^(-) ions in the reaction Fe(OH)_(3) hArr Fe^(3+)(aq)+3OH^(-)(aq) is decreased by 1/4 times, then equlibrium concentration of Fe^(3+) will increase by

In 2-butene, which one of the following statements is true ?

If the concentration of lead iodide in its saturated solution at25^@C be 2xx10^(-3) mol per litre its solubility product is :

In 1st row transition series the highest oxidation number is shown by

If the concentration of N_2 ,H_2 and NH_3 are 1,2,3, respectively , their concentration at equilibrium will be : N_2 + 3H_2 hArr 2NH_3.

In 1984, the Bhopal gas tragedy took place because methyl isocyanate :